Using the Milwaukee 2606-20 drill driver is easy. First, make sure the battery is fully charged. Then, insert the bit into the 1/2-inch metal chuck and tighten it. You can adjust the speed according to your task - use the lower speed for tougher jobs and the higher speed for quicker tasks. When using it, keep the tool steady and apply even pressure. As for maintenance, after each use, wipe the tool clean to remove dust and debris. Check the chuck regularly to ensure it's working properly. If the tool gets wet, dry it thoroughly before storing. Remember, the REDLINK™ Intelligence system is there to protect the tool, but don't abuse it. And always refer to the user manual for detailed instructions and safety guidelines.